Caporegime
To be fair you can also be skinny and unhealthy.
Incorrect use of 'to be fair'
The point is, you can be skinny and healthy and skinny and unhealthy, you cannot be obese and healthy.
A bit of strawmanning would be that drinking peanut butter smoothie can kill you (if you have an allergy) or not (if you don't), however drinking a ricin smoothie will kill you regardless. Which is a better thing to risk drinking?